[英]List to JSON string with Thymeleaf and Spring Boot converter
I'm working on a service that produces HTML pages via Thymeleaf templates.我正在开发一项通过 Thymeleaf 模板生成 HTML 页面的服务。 In one of those templates I would like to have an HTML attribute as a JSON string.在其中一个模板中,我希望将 HTML 属性作为 JSON 字符串。 The related Object in my context is an ArrayList<String>
.我上下文中的相关对象是ArrayList<String>
。 Without doing anything the output would be "[item1, item2]"
but I want "["random","stuff"]"
.如果不做任何事情,输出将是"[item1, item2]"
但我想要"["random","stuff"]"
。
I've read about Converter
and Formatter
and I thought that was the way to go.我已经阅读了关于Converter
和Formatter
,我认为这是要走的路。 But I cannot get my conversion system to work.但我无法让我的转换系统工作。
Here is my custom Converter
:这是我的自定义Converter
:
public class ListConverter implements Converter(ArrayList<String>, String {
public String convert (ArrayList<String> source) {
return new JSONArray(source).toString();
}
}
The main class looks like主类看起来像
@SpringBootApplication
public class TheApplication extends WebMvcConfigurerAdapter {
public static void main(String[] args) {
SpringApplication.run(PageServiceApplication.class, args);
}
@Bean
public ListConverter listConverter() {
return new ListConverter();
}
@Override
public void addFormatters(FormatterRegistry registry) {
registry.addConverter( listConverter() );
}
}
Finally the Thymeleaf template looks like最后 Thymeleaf 模板看起来像
<some-webcomponent xmlns:th="http://www.thymeleaf.org"
th:attrappend="tags=${data.tags} ...">
</some-webcomponent>
So tags
is my ArrayList<String>
.所以tags
是我的ArrayList<String>
。 I have also tried forcing the conversion with ${{data.tags}}
or with ${#conversions.convert(data.tags, 'String'}
but the only this is does is turn "[item1, item2]"
to "item1,item2"
.我还尝试使用${{data.tags}}
或${#conversions.convert(data.tags, 'String'}
但唯一的做法是将"[item1, item2]"
变为"item1,item2"
。
Doing tags=${new org.json.JSONArray(data.tags)}
works but I could like to have that elsewhere and probably not only for ArrayList<String>
.做tags=${new org.json.JSONArray(data.tags)}
工作,但我想在其他地方有它,可能不仅仅是ArrayList<String>
。
So my questions are :所以我的问题是:
Converter
the way to go ? Converter
是要走的路吗?Thank you.谢谢你。
For whatever reason, it works using List instead of ArrayList.无论出于何种原因,它都使用 List 而不是 ArrayList。 Also, I would get rid of the addFormatters method.另外,我会摆脱 addFormatters 方法。 You just need the bean declaration.您只需要 bean 声明。
Spring Boot:弹簧靴:
@SpringBootApplication
public class TheApplication extends WebMvcConfigurerAdapter {
public static void main(String[] args) {
SpringApplication.run(PageServiceApplication.class, args);
}
@Bean
public Converter<List<String>, String> converter() {
return new Converter<List<String>, String>() {
public String convert(List<String> source) {
return new JSONArray(source).toString();
}
};
}
}
Thymeleaf (double bracket for tags) Thymeleaf(标签的双括号)
<some-webcomponent xmlns:th="http://www.thymeleaf.org"
th:attrappend="tags=${{data.tags}} ...">
</some-webcomponent>
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